/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.csp.sentinel.traffic;

import java.util.List;

/**
 * @author panxiaojun233
 */
public interface RouterFilter {

    /**
     * Filter instanceList with current routing rule and only return the instances that comply with the rule.
     *
     * @param instanceList instance List
     * @param context      traffic context
     * @return result instance List
     * @throws TrafficException
     */
    List<Instance> filter(List<Instance> instanceList, TrafficContext context) throws TrafficException;

}
